There is a condition where a dog's nails shed. From what I understand, it's very painful. I don't believe Parvo should have made her lose all her hair. I would call your vet and have her looked at. If nothing else, she may have some nutrient deficiencies that are causing this.
Seger vom Sitz von der Hose
Forever loved and missed.....Banshee
~The strength of one's opinion should not exceed their knowledge on the matter~